Ivory - Leucistic?

I've asked around but haven't really been able to find the answer. Can somebody tell me whether an Ivory is another leucistic animal, similar to super mojaves, with a head stamp/faint stripe on the back? Reading definitions of leucism, it looks like leucism is a reduction in pigment production and does not require a full lack of pigment (as in a lesser/lesser or lesser/mojave)... so are Ivories just another form of leucistic ball python?

great question,i wondered that myself,would like to really see this answer.

Here's an article I found a while back that is fairly interesting on understanding reptile color terminology. According to the author, leucism requires a complete lack of pigment. Of course, he also disagrees with the current usage of albinism.

http://vetherppath.hubpages.com/hub/...or-Terminology

I'm not sure how factual everything is but it's worth reading once. The author claims to be a herpetologist but he certainly has an axe to grind and his tone kind of turned me off, correct info or not.